Major update! Added a new feed with archival data so now script has -Start and -End dates you can use. -Quakes has been changed to -Last. Markers have been changed from numbered markers to circles whose size and color are dictated by the magnitude of the quake.
Read the help on this one!

All I get is WARNING: Unable to retrieve earthquake information from http://earthquake.usgs.gov/earthquakes/feed/v1.0/summary/4.5_month.geojson because The term 'Invoke-RestMethod' is no
t recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct
and try again.
Any Help?